\Toad"stone`\, n.
1. (Min.) A local name for the igneous rocks of Derbyshire,
   England; -- said by some to be derived from the German
   todter stein, meaning dead stone, that is, stone which
   contains no ores.
2. Bufonite, formerly regarded as a precious stone, and worn
   as a jewel. See {Bufonite}.